The Celtics will enter training camp with potentially 11 new players, including four new starters — Irving, Hayward, Marcus Morris, and perhaps Jaylen Brown to join Al Horford. Ainge also added Aron Baynes, Daniel Theis, and Shane Larkin, while taking Jayson Tatum and Semi Ojeleye in the draft. “This isn’t any sort of plan like we wanted to make a whole bunch of changes — part of it is just managing payroll and getting guys to fit on the court, just building a team,” Ainge said. “It’s not about getting rid of somebody or bringing new faces in, but in the world we live in today you have a salary cap and a luxury tax and there are short contracts that are attached. When I played, I signed a six-year contract. Now, most contracts are four years [at the longest]. It’s just the nature of our business and it’s not ideal not to have continuity. But there are rewards for a freshness. What really matters is how well they play and as I said, time is our judge.”